To provide an assembly structure which can be disassembled without directly contacting an engaged part.

The assembly structure includes: a support part 10 having elastically deformable engaging pieces 12a and 12b with engaging pawls 13a and 13b formed at distal ends; and a knob having an engagement receiving part which can be engaged with the engaging pawls 13a and 13b, and by bringing the support part 10 and the knob relatively close, the engaging pawls 13a and 13b and the engagement receiving part are engaged, and the support part 10 and the knob are assembled. The assembly structure includes second inclined surfaces 15a and 15b to be abutted to the engagement receiving part for guiding elastic deformation of the engaging pieces 12a and 12b so as to disengage the engagement receiving part and the engaging pawls 13a and 13b when the knob assembled with the support part 10 receives force in a vehicle advancing direction.